Article

Efficient diode-pumped actively Q-switched Nd : YAG/BaWO4 intracavity Raman laser

Department of Electrophysics, National Chiao Tung University, Hsinchu, Taiwan.
Optics Letters (Impact Factor: 3.29). 01/2006; 30(24):3335-7. DOI: 10.1364/OL.30.003335
Source: PubMed

ABSTRACT

Barium tungstate (BaWO4) is employed to achieve efficient stimulated Raman scattering conversion in a compact diode-pumped actively Q-switched Nd:YAG laser. With an incident pump power of 9.2 W, 1.56 W of 1181 nm first-Stokes average output power was generated at a pulse repetition rate of 20 kHz, corresponding to an optical-to-optical conversion efficiency of 16.9%.

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    • "Ba(NO 3 ) 2 [9] , LiIO 3 [10] , KGd(WO 4 ) 2 [11] , PbWO 4 [12] , and BaWO 4 [13] [14] [15] [16] [17] [18] [19] are well known materials for SRS. Further more, YVO 4 and GdVO 4 were found to be the efficient χ (3) -materials for Raman laser [20] . "
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    ABSTRACT: The efficient stimulated Raman scattering conversion in a diode-pumped actively Q-switched Nd:YAG laser was achieved with an undoped YVO4 crystal as a Raman shifter. With an incident pump power of 16.2 W, 1176-nm first Stokes average output power of 2.97 W was generated at a pulse repetition rate of 50 kHz. The maximum pulse energy is higher than 83 muJ at both 20 kHz and 30 kHz. With mode-locked modulation, the effective pulse width far above threshold is usually below 5 ns. With an incident pump power of 7.62 W, the peak-power of 43.5 kW was demonstrated at 20 kHz.
    Full-text · Article · Mar 2008 · Proceedings of SPIE - The International Society for Optical Engineering
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    • "In these theoretical models, the generation and interaction with anti-Stokes and high order Stokes waves are neglected, and the term describing four wave mixing is omitted. The validity of these assumptions can be verified by the experimental results of us and other researchers [5] "
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    ABSTRACT: The normalized space-dependent rate equations are deduced assuming the intracavity photon densities and initial population-inversion density to be of Gaussian spatial distributions in the diode-pumped actively Q -switched intracavity Raman lasers. Numerical calculations are carried out to investigate the influences of these normalized variables on the pulse parameters of the first Stokes. The rate equations under the planewave approximation are also normalized and solved numerically, and the results show the obvious discrepancies from those of the space-dependent theory. The spontaneous Raman scattering factor in rate equations are deduced in detail for the first time, and the oscillating threshold of the first Stokes inside the resonator is deduced analytically. A sample calculation for an actively Q -switched self-Raman laser is presented to demonstrate the use of the curves and related formulas.
    Preview · Article · Sep 2007 · IEEE Journal of Quantum Electronics
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    • "In this theoretical model, the generation and interaction with anti-Stokes and high-order Stokes waves are neglected, and the term describing four-wave mixing is omitted. The validity of these assumptions can be verified by the experimental results of us and other researchers [7]–[9]. "
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    ABSTRACT: The intracavity photon densities and the initial population inversion density were assumed to be Gaussian distributions in the rate equations of the laser diode end-pumped actively Q-switched intracavity Raman laser. These space-dependent rate equations were solved numerically. In the experiment, an efficient self-Raman laser was realized based on the multifunctional Nd:YVO<sub>4</sub> laser crystal with the acoustooptic Q-switch. The output, temporal, and spectral characteristics of the self-Raman laser were investigated experimentally in detail. The performance of the self-Raman laser was studied numerically, and the theoretical results showed the main trends of the intracavity Raman laser, which are in agreement with the experimental ones
    Full-text · Article · Oct 2006 · IEEE Journal of Quantum Electronics
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